Cozumel Mexico about a month ago. Due to heavy tequila consumption at the time I could not give you any more details! ;)

I've found many simular corals on many beaches, i would venture to say that it is not a fossil.  It does amaze me as well how they can seem as though they are fossils though they are not. Whatever the cause for the coral to be broken from its rock, it had probably been in route to the beach for a couple years and in the surf for several months. The hard coral Skelton in make primarily of calcium carbonate AKA limestone, which gives it it's hard and heavy feel. 

Well, here's a huge coincidence for you...
My son and I went to the Rutgers University Geology Museum Open House today.  It is an annual funraiser they do where they open the museum to the public, have crafts and activities for kids, open up their gift shop, and host a pretty large mineral sale where they sell off rocks/minerals/fossils/shells that have been donated to the university or collected over the years.
...anyway, what should I see on the table but about 10 fossilized corals for sale.  They were various shapes and sizes.  3 of them looked a lot the one ChrisK found:

    

Sorry for they poor pix quality -- I only had a crummy old phone with me...

...like I said, huge coincidence...
Jim

Wow Jim! Talk about perfect timing! Thanks for the pics,They look very nice!Sounds like you guys had a great time.